Best app for tracking periods/fertility/ovulation for irregular cycles? (TTC)

[23hol]

There's just so many and I'm finding it all a bit confusing. Any particular recommendations? Many make the assumption that everyone has a set cycle length (I seem to vary quite a lot and would like to input my own dates). Any ideas please?

I recommend the app Fertility Friend, but only if you're up for giving BBT charting a go? I also have irregular cycles and I found it so helpful as it gave me a good idea of when I ovulated and when my period was due.

I have long cycles (42-46 days) and use the Flo app, I have found it to be pretty accurate in terms of ovulation prediction. The dates it flags coincide with ovulation kit results and physical symptoms. It allows a good amount of flexibility with dates etc.